Function spawn

lib/git.js:28–48

* Util function for handling spawned processes as promises. * @param {string} exe Executable. * @param {Array } args Arguments. * @param {string} cwd Working directory. * @return {Promise} A promise.

(exe, args, cwd)

 * @return {Promise} A promise.
 */
function spawn(exe, args, cwd) {
  return new Promise((resolve, reject) => {
    const child = cp.spawn(exe, args, {cwd: cwd || process.cwd()});
    const buffer = [];
    child.stderr.on('data', (chunk) => {
      buffer.push(chunk.toString());
    });
    child.stdout.on('data', (chunk) => {
      buffer.push(chunk.toString());
    });
    child.on('close', (code) => {
      const output = buffer.join('');
      if (code) {
        const msg = output || 'Process failed: ' + code;
        reject(new ProcessError(code, msg));
      } else {
        resolve(output);
      }
    });
  });
}

/**
 * Create an object for executing git commands.